Geographic Information and Concentration of Risk - Schedule of Long-lived Assets (Details) (USD $) In Thousands, unless otherwise specified	Jan. 27, 2013	Jan. 29, 2012
Geographic Information And Concentration Of Risk [Line Items]
Long-lived assets	$ 101,837	$ 69,713
Located within the United States
Geographic Information And Concentration Of Risk [Line Items]
Long-lived assets	53,858	47,612
Located outside the United States
Geographic Information And Concentration Of Risk [Line Items]
Long-lived assets	$ 47,979	$ 22,101

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 38

-Subparagraph b(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_NoncurrentAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant